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Subsequent Events (Details) (USD $)			1 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Apr. 30, 2014 Subsequent Event [Member] Bismarck Office Building [Member] sqft
Subsequent Event [Line Items]
Purchase price			$ 5,400,000
Rentable square feet			99,200
Down payment for the property acquired			3,900,000
Promissory note issued for property acquired	$ 88,911,866	$ 89,551,724	$ 2,500,000
Fixed interest rate on mortgage (in hundredths)			6.12%
Maturity date			Oct. 01, 2016

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Area of a real estate property.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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